Работа с EXCEL
https://www.excel-easy.com/
https://www.excel-easy.com/examples/save-in-97-2003-format.html
https://www.excel-easy.com/examples/zoom.html
https://www.excel-easy.com/examples/split.html
https://www.excel-easy.com/examples/freeze-panes.html
Nonlinear Regression
https://www.youtube.com/watch?v=X4jneorGsls
